JP3868234B2 - Crimp terminal - Google Patents

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Publication number
JP3868234B2
JP3868234B2 JP2001213950A JP2001213950A JP3868234B2 JP 3868234 B2 JP3868234 B2 JP 3868234B2 JP 2001213950 A JP2001213950 A JP 2001213950A JP 2001213950 A JP2001213950 A JP 2001213950A JP 3868234 B2 JP3868234 B2 JP 3868234B2
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conductor
crimping
bottom plate
crimp terminal
plate portion
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JP2003031274A (en
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忠久 坂口
俊弘 槙
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Yazaki Corp
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Yazaki Corp
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Priority to JP2001213950A priority Critical patent/JP3868234B2/en
Priority to GB0216129A priority patent/GB2377830B/en
Priority to US10/193,122 priority patent/US6749457B2/en
Priority to DE10231887A priority patent/DE10231887B4/en
Publication of JP2003031274A publication Critical patent/JP2003031274A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
    • H01R4/183—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section
    • H01R4/184—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section comprising a U-shaped wire-receiving portion
    • H01R4/185—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section comprising a U-shaped wire-receiving portion combined with a U-shaped insulation-receiving portion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
    • H01R4/188—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping having an uneven wire-receiving surface to improve the contact

Description

【０００１】
【発明の属する技術分野】
本発明は、電線を加締接続する圧着端子に関し、詳しくは、端子の底板部等の内面に形成され、端子と電線導体との電気的な接続性能の向上及び機械的な接続性能の向上にとって有効に作用する導体係止溝（セレーション）の改良に関するものである。
【０００２】
【従来の技術】
図６及び図７は、従来の圧着端子の例を示したものである。
図６に示した圧着端子１は、ねじ止め用の圧着端子で、ねじ挿通穴２ａを有した先端のねじ止め端子部２の後方に、導体加締め部４及び被覆加締め部５を順次設けたもので、一枚の金属板のプレス成形によって、一体形成される。
【０００３】
導体加締め部４は、図８にも示すように、被覆電線７の絶縁被覆７ａを剥いで露出させた電線導体７ｂを圧着接続する部分で、電線導体７ｂを載置する底板部４ａと、この底板部４ａの両側に延出されて、圧着設備９（図９参照）によって底板部４ａ上の電線導体７ｂに加締め付けられる一対の加締め爪４ｂ，４ｂとを備える。
【０００４】
被覆加締め部５は、被覆電線７を絶縁被覆７ａの上から押さえて固定する部分で、被覆電線７を載置する底板部５ａと、この底板部５ａの両側に延出されて、圧着設備９（図９参照）によって底板部５ａ上の被覆電線７に加締め付けられる一対の加締め爪５ｂ，５ｂとを備える。
【０００５】
圧着設備９は、図９及び図１０に示すように、導体加締め部４及び被覆加締め部５の底板部４ａ，５ａを支えるアンビル９ａと、アンビル９ａの上方に昇降可能に装備されて加締め爪４ｂ，４ｂ及び加締め爪５ｂ，５ｂを加締め成形する２つのクリンパ９ｂ，９ｃとを備えた一種のプレス装置である。
【０００６】
また、図７に示す圧着端子１１は、複数本の被覆電線１２ａ，１２ｂ，１２ｃの導体相互を一括接続する中継用の圧着端子で、複数本の電線導体１３を載置する底板部１１ａと、この底板部１１ａの両側に延出装備されて、圧着設備によって底板部１１ａ上の各電線導体１３に加締め付けられる一対の加締め爪１１ｂ，１１ｂとを金属板のプレス成形で一体形成した構造である。
【０００７】
これらの圧着端子において、電線導体と底板部との電気的な接続性能及び機械的な接続性能を高めるために、図１１、図１２に示したように、電線導体が接触する端子の底板部等の内面１６に、電線導体の軸線と交差する方向（通常、直交方向）に延伸した複数本の凹状の導体係止溝１７（以下、セレーションと呼ぶ）を装備することが知られている。
なお、従来の場合、セレーションの各溝幅及び各溝の深さは、全て、同一寸法及び同一形状である。
【０００８】
そして、セレーション１７は、加締め爪４ｂ，４ｂ，１１ｂ，１１ｂが加締め付けられた際、溝の縁が強く押圧されて電線導体７ｂ，１３の表面に適度に食い込むことで、機械的な接続性能及び電気的な接続性能の双方を向上させることができ、加締めによる接続信頼性を確保する。
【０００９】
【発明が解決しようとする課題】
ところで、セレーション１７はその縁が電線導体７ｂ，１３に食い込んだ際、導体表面に酸化によって形成される酸化被膜を除去できるために、食い込み量が大きくなるように設定される必要がある。そして、食い込み量を大きくするには、セレーション１７の深さを深く形成する必要がある。
一方、食い込み量が大きくなるように設定すると、外部より引張力が電線導体７ｂ，１３に作用した場合に、加締め付けられた導体部位に応力が集中するため、電線導体７ｂ，１３の切断が生じ易くなり、結果的に機械的な接続性能の低下を招く。
【００１０】
そこで、電気的な接続性能と機械的な接続性能の向上がバランス良く得られるように、電線導体の外径を考慮して、セレーション１７の深さや、加締め爪等の加締め付け量を設定することができる。
しかし、自動車用ワイヤハーネス等で使用される圧着端子は、接続対象となる被覆電線の導体径が種々のものであったり、また、外径が異なる太さの導体同士を一括して圧着接続しなければならない場合も少なくない。
そのため、電気的な接続性能と機械的な接続性能の双方の向上がバランス良く得られるようにセレーション１７の深さや、加締め爪等の加締め付け量を設定することは非常に難しい。例えば、外径の異なる複数本の電線導体を一括して圧着した場合、太い電線導体は電気的な接続性能及び機械的な接続性能が向上されても、細い電線導体はセレーション１７の食い込み量が過大になって、僅かな張力でも簡単に切断を生じる虞があった。
また、圧着対象となる電線導体７ｂ，１３のうち、一番細径の電線導体に標準を合わせてセレーション１７の深さを設定し、機械的な接続性能の確保を図ると、太い電線導体においては溝の縁が導体表面の酸化被膜を除去するまでに至らず、電気的な接続性能の不良を招く虞があった。
【００１１】
このような相反する不都合を解消するため、図１３及び図１４に示す圧着端子２１が提案されている。
この圧着端子２１は、特開昭５９−１６５３９０号公報に開示されたもので、加締め付け量が異なる二つの導体加締め部２３，２４を装備し、電線導体の基端側に位置する導体加締め部２３は、加締め付け量が小さくなるように、加締め爪２３ｂ，２３ｂの高さと圧着設備２６におけるクリンパ２６ｂを調整することで、セレーションの導体への食い込み量が小さな圧着部を形成する。
一方、電線導体の先端側に位置する導体加締め部２４は、加締め付け量が大きくなるように、加締め爪２４ｂ，２４ｂの高さと圧着設備２６におけるクリンパ２６ｃを調整することで、セレーションの導体への食い込み量が大きな圧着部を形成する。
【００１２】
このように、加締め付け量が異なる２種の導体加締め部２３，２４を装備することで、細径と太径の電線導体が混在する場合であっても、セレーションによる食い込みの過不足をなくし、電気的な接続性能及び機械的な接続性能の双方を向上させることができた。
【００１３】
ところが、図１３及び図１４に示した圧着端子２１では、導体加締め部２３，２４が増えて、端子構造の複雑化や大型化という問題を招き、更には、圧着設備２６もクリンパ２６ｃの追加によって複雑化し、設備コストの増大を招くという問題が生じた。
【００１４】
本発明は上記事情に鑑みなされたもので、例えば細径と太径の電線導体が混在するような圧着作業時に、圧着端子の構造の複雑化や大型化を招くことがなく、且つ、圧着設備の複雑化を招くこともなく、何れの導体に対しても食い込みの過不足をなくして、安価に電気的な接続性能及び機械的な接続性能の双方を向上させることのできる圧着端子を提供することを目的とする。
【００１５】
【課題を解決するための手段】
上記目的を達成するための本発明に係る圧着端子は、電線導体を載置する底板部と、この底板部の両側に延出されて前記電線導体に加締め付けられる一対の加締め爪とを備え、且つ、少なくとも前記底板部の内面に、前記電線導体の軸線と交差する方向に延在する複数本の導体係止溝を装備した圧着端子において、前記複数本の導体係止溝は、前記加締め爪が加締め付けられたとき溝の縁が前記電線導体に食い込むようになされると共に、食い込み量が異なるように溝の深さを相異させたことを特徴とする。
【００１６】
そして、上記構成によれば、加締め爪の加締め操作で、複数本の導体係止溝に押圧された電線導体に対し、溝の深さが浅い導体係止溝は過大な食い込みを防止して機械的な接続性能の向上を持たらし、また溝の深さが深い導体係止溝は過小な食い込みによる酸化被膜の残存を防止して、電気的な接続性能の向上をもたらす。
【００１７】
また、上記構成によれば、複数本の導体係止溝は、溝の深さを相異させた複数種とされることによって、細径及び太径の双方の電線導体に対しそれぞれ適度の食い込み量を確保できる。
【００１８】
なお、好ましくは、前記圧着端子において、前記複数本の導体係止溝のうち、電線導体の基端側に対応して前記底板部の端部寄りに位置する導体係止溝の溝の深さを、少なくとも前記底板部の中央寄りに位置する他の導体係止溝よりも浅く設定したことを特徴としても良い。
このようにすると、電線導体を圧着接続する圧着端子の導体加締め部では、電線導体の基端側では、導体係止溝と導体との食い込みを浅く抑えて、過大な食い込みに起因する機械的な接続性能の低下を確実に防止することができる。
【００１９】
【発明の実施の形態】
以下、本発明に係る圧着端子の好適な実施の形態を添付図面に基づいて詳細に説明する。
図１乃至図３は本発明に係る圧着端子の一実施の形態を示したもので、図１は本発明による圧着端子の導体加締め部における展開図、図２は図１に示した導体加締め部の横断面図、図３は図１のＤ−Ｄ線に沿う断面図である。
【００２０】
この実施の形態の圧着端子３１は、金属板のプレス成形によって一体形成したねじ止め用の圧着端子３１で、図１に示すように、基端側から順に、被覆加締め部３３と導体加締め部３５とを連設して構成されている。
被覆加締め部３３は、被覆電線３７を載置する底板部３３ａの両側に延出した一対の加締め爪３３ｂ，３３ｂを備えて構成され、底板部３３ａ上に載置された被覆電線３７に対し、圧着設備９（図９、図１０参照）によって絶縁被覆３７ａ上から一対の加締め爪３３ｂ，３３ｂを加締め付けることにより、被覆電線３７を固定する。
【００２１】
導体加締め部３５は、図２に示すように、被覆電線３７の一端部において絶縁被覆３７ａを剥いで露出させた電線導体３７ｂを載置する底板部３５ａと、この底板部３５ａの両側に延出した一対の加締め爪３５ｂ，３５ｂとを備えて構成され、底板部３５ａ上に載置された電線導体３７ｂに対し、一対の加締め爪３５ｂ，３５ｂを圧着設備９によって加締め付けることにより、被覆電線３７を固定する。
導体加締め部３５には、電線導体３７ｂが接触する底板部３５ａ及び加締め爪３５ｂ，３５ｂの内面に、電線導体３７ｂの軸線と交差する方向に延在する３本の導体係止溝、所謂セレーション４１，４２，４３が形成されている。
【００２２】
これらのセレーション４１，４２，４３は、加締め爪３５ｂ，３５ｂが加締め付けられたとき、溝の縁が電線導体３７ｂに食い込むように作用して、電線導体３７ｂと導体加締め部３５との電気的な接続性能及び機械的な接続性能を高めるためのもので、溝の幅寸法ｗは何れの溝も同一である。
しかし、本実施の形態の場合、図３に示すように、セレーション４１，４２，４３は電線導体３７ｂに対する食い込み量が異なるように、３本のセレーション４１，４２，４３のうち、電線導体３７ｂの基端側に対応して底板部３５ａの端部寄りに位置したセレーション４１の溝の深さｈ１が、底板部３５ａの中央寄り及び先端寄りに位置した他の２本のセレーション４２，４３の溝の深さｈ２よりも浅く設定されている。
【００２３】
このように構成した圧着端子３１では、底板部３５ａ上の電線導体３７ｂが加締め爪３５ｂ，３５ｂの加締め操作で加締め付けられると、セレーション４１，４２，４３はそれぞれの縁が電線導体３７ｂの表面に食い込むようになされる。その際、溝の深さｈ１の浅いセレーション４１は、導体３７ｂに対する過大な食い込みを防止して、適度な食い込みにより機械的な接続性能の向上をもたらす。一方、溝の深さｈ２の深いセレーション４２，４３は、深い食い込みによって、電線導体３７ｂの表面に形成される酸化皮膜を除去して電気的な接続性能の向上をもたらす。
【００２４】
なお、上記作用は、適用される電線導体の外径が細い場合について述べたが、勿論、電線導体の外径が太い場合には、溝の深さｈ２の深いセレーション４２，４３が、電気的な接続性能及び機械的な接続性能に適した食い込み量を確保することができる。従って、電気的な接続性能及び機械的な接続性能の何れか一方が不良になるような不都合も生じない。
【００２５】
また、上記実施の形態では、３本のセレーション４１，４２，４３の溝の深さを複数種設定することによって、細径及び太径の双方の電線導体３７ｂに対して適度の食い込み量を確保しているので、圧着端子３１上での導体加締め部の追加構造等を一切必要としない。
従って、細径と太径の電線導体が混在するような場合でも、圧着端子３１構造の複雑化や大型化を招くことがなく、且つ、圧着設備の複雑化を招くこともなく、何れの太さの導体に対しても食い込み量の過不足をなくして、安価に電気的な接続性能及び機械的な接続性能の双方を向上させることができる。
【００２６】
更に、本実施の形態の場合は、図３に示すように、電線導体３７ｂの基端側に対応して設けられるセレーション４１は、底板部３５ａの中央寄りに位置する他のセレーション４２，４３よりも溝の深さを浅く設定しているため、電線導体３７ｂの基端側では、溝と導体との食い込み量を浅く抑えて、過大な食い込みに起因する機械的な接続性能の低下を確実に防止することができる。
【００２７】
次に、本発明の他の実施の形態を、図４に基づいて説明する。
なお、図４は図３のＥ−Ｅ線に沿った断面図である。つまり、先の実施の形態では、各セレーション４１，４２，４３は溝の深さが、それぞれのセレーション４１，４２，４３内では一定とした。しかし、本実施の形態では、真ん中に位置するセレーション４２では、中央部の溝の深さｈ３が、両端部の溝の深さｈ２よりも浅く設定されている。
これにより、３本の真ん中に位置するスレーション４２は中央部が細径の導体の係止に積極活用できる。また、このスレーション４２は両端部の溝の深さｈ２が深い食い込みを達成し、電気的な接続性能の向上を図ることができる。なお、その他の構成は、先の実施の形態と同様に形成されている。
【００２８】
なお、上記した各実施の形態は、ねじ止め用の圧着端子の場合を示したが、本発明は、電線の導体相互を圧着接続する中継用の圧着端子にも適用することができる。
しかし、中継用の圧着端子の場合は、図５に示すように、導体加締め部５５の内面に装備する３本のセレーション６１，６２，６３のうち、両端部のセレーション６１，６３を、機械的な接続に機能できるように、溝の深さｈ１を浅く設定し、中央部のセレーション６２を、電気的な接続に機能できるように、溝の深さｈ２を深く設定すると良い。
【００２９】
なお、本発明において、導体加締め部の内面に装備するセレーションの数量は、上記実施の形態に限らない。２本以上の任意数に設定することができる。
【００３０】
【発明の効果】
以上述べたように、本発明の圧着端子によれば、加締め爪の加締め操作で、複数本のセレーションに押圧された電線導体は、導体の外径が細い場合には、溝の深さが浅いセレーションが、導体に対して過大な食い込みを防止して適度の食い込みによる機械的な接続性能の向上を持たらし、また、溝の深さが深いセレーションが、導体に対して過小な食い込みによる酸化被膜の残存を防止し、深い食い込みによる酸化皮膜の除去を可能にして電気的な接続性能の向上をもたらす。
勿論、導体の外径が太い場合は、溝の深さが深いセレーションが、電気的な接続性能と機械的な接続性能に適した食い込みを確保するため、電気的な接続性能及び機械的な接続性能の何れか一方が不良になるような不都合も生じない。
【００３１】
また、導体係止溝の溝の深さを複数種設定することによって、細径及び太径の双方の電線導体に対して適度の食い込みを確保するようにし、圧着端子上での導体加締め部の追加等は一切必要ない。
従って、細径と太径の電線導体が混在するような圧着作業時に、圧着端子の構造の複雑化や大型化を招くことがなく、且つ、圧着設備の複雑化を招くこともなく、何れの導体に対しても食い込みの過不足をなくして、安価に電気的な接続性能及び機械的な接続性能の双方を向上させることができる。
【００３２】
また、請求項２に記載の構成とすると、電線導体を圧着接続する圧着端子の導体加締め部では、電線導体の基端側において、セレーションと導体との食い込み量を小さく抑えて、過大な食い込みに起因する機械的な接続性能の低下を確実に防止することができる。
【図面の簡単な説明】
【図１】本発明に係る圧着端子の一実施の形態の導体加締め部の展開図である。
【図２】図１に示した導体加締め部の横断面図である。
【図３】図１のＤ−Ｄ線に沿う断面図である。
【図４】本発明に係る圧着端子の他の実施の形態で、図３のＥ−Ｅ線に沿う断面図である。
【図５】本発明に係る圧着端子の他の実施の形態で、導体加締め部の展開図である。
【図６】従来のねじ止め用の圧着端子の斜視図である。
【図７】従来の中継用の圧着端子の側面図である。
【図８】従来の圧着端子の導体加締め部の横断面図である。
【図９】圧着端子に対して加締め爪の加締め成形を行う圧着設備の正面図である。
【図１０】図９のＢ−Ｂ線に沿う断面図である。
【図１１】図８のＡ−Ａ線に沿う断面図である。
【図１２】図１１のＣ−Ｃ線に沿う断面図である。
【図１３】従来の２段加締め式の圧着端子の斜視図である。
【図１４】図１３に示した圧着端子の加締め成形を行う圧着設備の縦断面図である。
【符号の説明】
３１ 圧着端子
３５ 導体加締め部
３５ａ 底板部
３５ｂ 加締め爪
４１，４２，４３ セレーション（導体係止溝）
５５ 導体加締め部
６１，６２，６３ セレーション（導体係止溝）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crimp terminal for caulking and connecting an electric wire, and more specifically, formed on an inner surface of a bottom plate portion of the terminal, etc., for improving electrical connection performance between the terminal and the wire conductor and improving mechanical connection performance. The present invention relates to an improvement of a conductor locking groove (serration) that works effectively.
[0002]
[Prior art]
6 and 7 show examples of conventional crimp terminals.
The crimp terminal 1 shown in FIG. 6 is a crimp terminal for screwing, and a conductor crimping part 4 and a covering crimping part 5 are sequentially provided behind the screw terminal part 2 at the tip having a screw insertion hole 2a. It is formed integrally by press molding of a single metal plate.
[0003]
As shown in FIG. 8, the conductor crimping portion 4 is a portion to which the electric wire conductor 7 b exposed by peeling off the insulating coating 7 a of the covered electric wire 7 is crimped and connected, and a bottom plate portion 4 a on which the electric wire conductor 7 b is placed, A pair of crimping claws 4b and 4b are provided that extend to both sides of the bottom plate portion 4a and are crimped to the wire conductor 7b on the bottom plate portion 4a by the crimping equipment 9 (see FIG. 9).
[0004]
The covering caulking portion 5 is a portion for pressing and fixing the covered electric wire 7 from above the insulating coating 7a, and is extended to both sides of the bottom plate portion 5a on which the covered electric wire 7 is placed and the bottom plate portion 5a. 9 (see FIG. 9), a pair of crimping claws 5b and 5b that are crimped to the covered electric wire 7 on the bottom plate portion 5a are provided.
[0005]
As shown in FIGS. 9 and 10, the crimping equipment 9 is equipped with an anvil 9 a that supports the bottom plate portions 4 a and 5 a of the conductor caulking portion 4 and the covering caulking portion 5, and can be moved up and down above the anvil 9 a. It is a kind of press device provided with two crimpers 9b and 9c for crimping and forming the clamping claws 4b and 4b and the crimping claws 5b and 5b.
[0006]
Further, the crimp terminal 11 shown in FIG. 7 is a relay crimp terminal that collectively connects the conductors of the plurality of covered wires 12a, 12b, and 12c, and a bottom plate portion 11a on which the plurality of wire conductors 13 are placed; A structure in which a pair of crimping claws 11b and 11b that are extended and installed on both sides of the bottom plate portion 11a and are crimped to the electric wire conductors 13 on the bottom plate portion 11a by a crimping facility are integrally formed by press molding of a metal plate. is there.
[0007]
In these crimp terminals, in order to improve the electrical connection performance and mechanical connection performance between the electric wire conductor and the bottom plate portion, as shown in FIGS. 11 and 12, the bottom plate portion of the terminal with which the electric wire conductor contacts, etc. It is known that a plurality of concave conductor locking grooves 17 (hereinafter referred to as serrations) extending in a direction intersecting the axis of the electric wire conductor (usually, an orthogonal direction) are provided on the inner surface 16.
In the conventional case, each groove width and each groove depth of the serration have the same dimensions and the same shape.
[0008]
The serration 17 is mechanically connected to the surface of the wire conductors 7b and 13 by pressing the edges of the grooves when the crimping claws 4b, 4b, 11b, and 11b are crimped. Both the electrical connection performance and the electrical connection performance can be improved, and the connection reliability by caulking is ensured.
[0009]
[Problems to be solved by the invention]
By the way, since the serration 17 can remove the oxide film formed by oxidation on the conductor surface when the edge bites into the electric wire conductors 7b and 13, it is necessary to set the biting amount to be large. In order to increase the biting amount, it is necessary to form the serration 17 deeply.
On the other hand, if the amount of biting is set to be large, when a tensile force is applied to the wire conductors 7b and 13 from the outside, stress concentrates on the crimped conductor parts, so that the wire conductors 7b and 13 are cut. As a result, the mechanical connection performance is deteriorated.
[0010]
Therefore, the depth of the serration 17 and the amount of crimping such as the crimping claws are set in consideration of the outer diameter of the wire conductor so that an improvement in electrical connection performance and mechanical connection performance can be obtained with a good balance. be able to.
However, crimp terminals used in automotive wire harnesses, etc. have various conductor diameters for the covered electric wires to be connected, or crimp conductors of conductors with different outer diameters are crimped together. There are many cases where it is necessary.
For this reason, it is very difficult to set the depth of the serration 17 and the amount of crimping of the crimping claws so that both the electrical connection performance and the mechanical connection performance can be improved. For example, when a plurality of wire conductors having different outer diameters are crimped together, a thick wire conductor has improved serrations 17 even though the electrical connection performance and mechanical connection performance are improved. There was a risk that cutting would occur easily even with a slight tension.
In addition, among the wire conductors 7b and 13 to be crimped, when the depth of the serration 17 is set by matching the standard with the thinnest wire conductor and the mechanical connection performance is ensured, However, the edge of the groove does not reach the removal of the oxide film on the conductor surface, which may cause poor electrical connection performance.
[0011]
In order to eliminate such conflicting inconveniences, a crimp terminal 21 shown in FIGS. 13 and 14 has been proposed.
This crimp terminal 21 is disclosed in Japanese Patent Application Laid-Open No. 59-165390, and is equipped with two conductor crimping portions 23 and 24 having different crimping amounts, and conductor crimping located on the proximal end side of the wire conductor. The tightening portion 23 adjusts the height of the crimping claws 23b and 23b and the crimper 26b in the crimping facility 26 so as to reduce the crimping amount, thereby forming a crimping portion with a small amount of serration into the conductor.
On the other hand, the conductor crimping portion 24 located on the distal end side of the wire conductor adjusts the height of the crimping claws 24b, 24b and the crimper 26c in the crimping facility 26 so that the amount of crimping is increased, thereby providing a serration conductor. Forms a crimped part with a large amount of bite.
[0012]
In this way, by providing two types of conductor crimping portions 23 and 24 having different crimping amounts, excessive and insufficient biting due to serration can be eliminated even when thin and large diameter wire conductors are mixed. Both electrical connection performance and mechanical connection performance could be improved.
[0013]
However, in the crimp terminal 21 shown in FIG. 13 and FIG. 14, the conductor crimping portions 23 and 24 are increased, resulting in a problem that the terminal structure is complicated and large, and the crimping equipment 26 is also provided with an additional crimper 26c. As a result, there is a problem that the equipment cost increases.
[0014]
The present invention has been made in view of the above circumstances, and, for example, at the time of a crimping operation in which thin and large-diameter wire conductors are mixed, the crimping terminal structure is not complicated and enlarged, and crimping equipment is provided. There is provided a crimp terminal that can improve both the electrical connection performance and the mechanical connection performance at a low cost without causing excessive or insufficient biting into any conductor without incurring any complications. For the purpose.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, a crimp terminal according to the present invention includes a bottom plate portion on which a wire conductor is placed, and a pair of crimping claws that are extended to both sides of the bottom plate portion and crimped to the wire conductor. In addition, in the crimp terminal provided with a plurality of conductor locking grooves extending in a direction intersecting the axis of the wire conductor on at least the inner surface of the bottom plate portion, the plurality of conductor locking grooves are The groove edge is bitten into the electric wire conductor when the claw is swaged, and the groove depth is varied so that the biting amount is different.
[0016]
And according to the said structure, with respect to the electric wire conductor pressed by the several conductor latching groove by the crimping operation of the crimping claw, the conductor latching groove with a shallow groove prevents excessive biting. Therefore, the conductor engagement groove having a deep groove prevents the remaining of the oxide film due to excessive biting and improves the electrical connection performance.
[0017]
Further, according to the above configuration, the plurality of conductor locking grooves are of a plurality of types with different depths of the grooves, so that appropriate bite into each of the small-diameter and large-diameter wire conductors. The amount can be secured.
[0018]
Preferably, in the crimp terminal, of the plurality of conductor locking grooves, the depth of the groove of the conductor locking groove located near the end of the bottom plate portion corresponding to the base end side of the electric wire conductor. May be set shallower than at least another conductor locking groove positioned near the center of the bottom plate portion.
In this way, at the conductor crimping portion of the crimp terminal for crimping and connecting the wire conductor, the penetration of the conductor locking groove and the conductor is kept shallow on the base end side of the wire conductor, and the mechanical cause due to excessive biting Thus, it is possible to reliably prevent a decrease in connection performance.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a crimp terminal according to the present invention will be described in detail with reference to the accompanying drawings.
1 to 3 show an embodiment of a crimp terminal according to the present invention. FIG. 1 is a development view of a conductor crimping portion of the crimp terminal according to the present invention, and FIG. 2 is a conductor crimp shown in FIG. FIG. 3 is a cross-sectional view taken along line DD of FIG. 1.
[0020]
The crimping terminal 31 of this embodiment is a screwing crimping terminal 31 integrally formed by press molding of a metal plate, and as shown in FIG. The unit 35 is connected to the unit 35.
The covering crimping portion 33 includes a pair of crimping claws 33b and 33b extending on both sides of the bottom plate portion 33a on which the covered electric wire 37 is placed, and is attached to the covered electric wire 37 placed on the bottom plate portion 33a. On the other hand, the covered electric wire 37 is fixed by crimping the pair of crimping claws 33b and 33b from above the insulating coating 37a by the crimping equipment 9 (see FIGS. 9 and 10).
[0021]
As shown in FIG. 2, the conductor crimping portion 35 has a bottom plate portion 35a on which the electric wire conductor 37b exposed by peeling off the insulating coating 37a at one end portion of the covered electric wire 37, and extends on both sides of the bottom plate portion 35a. A pair of crimping claws 35b, 35b are provided, and the pair of crimping claws 35b, 35b are crimped by the crimping equipment 9 against the electric wire conductor 37b placed on the bottom plate portion 35a. The covered electric wire 37 is fixed.
The conductor caulking portion 35 has three conductor locking grooves extending on the inner surface of the bottom plate portion 35a and the caulking claws 35b, 35b with which the electric wire conductor 37b comes into contact, extending in the direction intersecting the axis of the electric wire conductor 37b, so-called. Serrations 41, 42, and 43 are formed.
[0022]
These serrations 41, 42, 43 act so that the edge of the groove bites into the electric wire conductor 37 b when the caulking claws 35 b, 35 b are caulked, and the electric connection between the electric wire conductor 37 b and the conductor caulking portion 35. The groove width dimension w is the same for all the grooves.
However, in the case of the present embodiment, as shown in FIG. 3, the serrations 41, 42, 43 of the three serrations 41, 42, 43 of the serrations 41, 42, 43 are different from each other. The depth h1 of the groove of the serration 41 located near the end of the bottom plate portion 35a corresponding to the base end side is the groove of the other two serrations 42, 43 located near the center and the tip of the bottom plate portion 35a. It is set shallower than the depth h2.
[0023]
In the crimp terminal 31 configured as described above, when the wire conductor 37b on the bottom plate portion 35a is crimped by the crimping operation of the crimping claws 35b and 35b, the serrations 41, 42, and 43 each have an edge of the wire conductor 37b. It is made to bite into the surface. At that time, the shallow serration 41 with the groove depth h1 prevents excessive biting into the conductor 37b, and improves mechanical connection performance by appropriate biting. On the other hand, the deep serrations 42 and 43 having the groove depth h2 remove the oxide film formed on the surface of the electric wire conductor 37b by deep bite, thereby improving the electrical connection performance.
[0024]
In addition, although the said effect | action was described about the case where the outer diameter of the applied electric wire conductor is thin, of course, when the outer diameter of an electric wire conductor is thick, the deep serrations 42 and 43 of the groove depth h2 are electrically Bite amount suitable for the proper connection performance and mechanical connection performance can be ensured. Therefore, there is no inconvenience that either one of the electrical connection performance and the mechanical connection performance becomes defective.
[0025]
Further, in the above embodiment, by setting a plurality of kinds of groove depths of the three serrations 41, 42, 43, an appropriate amount of biting is ensured for both the small-diameter and large-diameter wire conductors 37b. Therefore, no additional structure or the like of the conductor crimping portion on the crimp terminal 31 is required.
Therefore, even when a thin wire conductor and a large wire conductor are mixed, the structure of the crimp terminal 31 is not complicated and large, and the crimp equipment is not complicated. Therefore, it is possible to improve both the electrical connection performance and the mechanical connection performance at a low cost by eliminating excessive or insufficient biting in the conductor.
[0026]
Furthermore, in the case of the present embodiment, as shown in FIG. 3, the serration 41 provided corresponding to the proximal end side of the electric wire conductor 37b is more than the other serrations 42 and 43 located closer to the center of the bottom plate portion 35a. However, since the depth of the groove is set to be shallow, the amount of biting between the groove and the conductor is kept shallow on the base end side of the electric wire conductor 37b, and the mechanical connection performance is deteriorated due to excessive biting. Can be prevented.
[0027]
Next, another embodiment of the present invention will be described with reference to FIG.
4 is a cross-sectional view taken along the line EE in FIG. That is, in the previous embodiment, each serration 41, 42, 43 has a constant groove depth within each serration 41, 42, 43. However, in the present embodiment, in the serration 42 located in the middle, the depth h3 of the groove at the center is set shallower than the depth h2 of the grooves at both ends.
Thereby, the slation 42 located in the middle of the three can be positively utilized for locking a conductor having a small diameter at the center. Further, the slation 42 achieves a deep biting of the groove depth h2 at both ends, and can improve the electrical connection performance. Other configurations are the same as in the previous embodiment.
[0028]
In addition, although each above-described embodiment showed the case of the crimp terminal for screwing, this invention is applicable also to the crimp terminal for relay which crimps and connects the conductors of an electric wire.
However, in the case of a crimp terminal for relay, as shown in FIG. 5, the serrations 61 and 63 at both ends of the three serrations 61, 62, and 63 provided on the inner surface of the conductor crimping portion 55 are machined. It is preferable to set the groove depth h1 shallow so that it can function as a general connection, and to set the groove depth h2 deep so that the central serration 62 can function as an electrical connection.
[0029]
In the present invention, the number of serrations provided on the inner surface of the conductor crimping portion is not limited to the above embodiment. Two or more arbitrary numbers can be set.
[0030]
【The invention's effect】
As described above, according to the crimping terminal of the present invention, the wire conductor pressed by the plurality of serrations by the caulking operation of the caulking claw has a groove depth when the outer diameter of the conductor is thin. Shallow serration prevents excessive biting into the conductor and improves mechanical connection performance by moderate biting, and serration with deep groove depth causes too little biting into the conductor. This prevents the remaining of the oxide film due to, and enables the oxide film to be removed by deep biting, thereby improving the electrical connection performance.
Of course, when the outer diameter of the conductor is thick, the serrations with deep grooves make sure that the serrations are suitable for the electrical connection performance and mechanical connection performance. There is no inconvenience that either one of the performances becomes defective.
[0031]
In addition, by setting multiple types of groove depth of the conductor locking groove, it is possible to ensure appropriate biting into both the small diameter and large diameter electric wire conductors, and the conductor crimping portion on the crimp terminal There is no need to add anything.
Therefore, at the time of crimping work in which thin and large-diameter wire conductors are mixed, the structure of the crimp terminal is not complicated and the size is not increased, and the crimping equipment is not complicated. It is possible to eliminate both excessive and insufficient biting into the conductor and improve both the electrical connection performance and the mechanical connection performance at low cost.
[0032]
Further, with the configuration according to claim 2, in the conductor crimping portion of the crimp terminal for crimping and connecting the wire conductor, the amount of biting between the serration and the conductor is kept small on the base end side of the wire conductor, and excessive bite It is possible to reliably prevent the mechanical connection performance from being deteriorated due to the above.
[Brief description of the drawings]
FIG. 1 is a development view of a conductor crimping portion of an embodiment of a crimp terminal according to the present invention.
FIG. 2 is a cross-sectional view of the conductor caulking portion shown in FIG.
3 is a cross-sectional view taken along the line DD in FIG. 1. FIG.
4 is a cross-sectional view taken along line EE of FIG. 3 in another embodiment of the crimp terminal according to the present invention.
FIG. 5 is a development view of a conductor caulking portion in another embodiment of the crimp terminal according to the present invention.
FIG. 6 is a perspective view of a conventional crimp terminal for screwing.
FIG. 7 is a side view of a conventional crimp terminal for relay.
FIG. 8 is a cross-sectional view of a conductor crimping portion of a conventional crimp terminal.
FIG. 9 is a front view of a crimping facility for crimping a crimping claw to a crimping terminal.
10 is a cross-sectional view taken along line BB in FIG.
11 is a cross-sectional view taken along line AA in FIG.
12 is a cross-sectional view taken along the line CC of FIG.
FIG. 13 is a perspective view of a conventional two-stage crimping type crimp terminal.
14 is a longitudinal sectional view of a crimping facility for performing crimping molding of the crimp terminal shown in FIG.
[Explanation of symbols]
31 Crimp terminal 35 Conductor caulking portion 35a Bottom plate portion 35b Caulking claws 41, 42, 43 Serration (conductor locking groove)
55 Conductor caulking part 61, 62, 63 Serration (conductor locking groove)

Claims (2)

電線導体を載置する底板部と、この底板部の両側に延出されて前記電線導体に加締め付けられる一対の加締め爪とを備え、且つ、少なくとも前記底板部の内面に、前記電線導体の軸線と交差する方向に延在する複数本の導体係止溝を形成した圧着端子において、
前記複数本の導体係止溝は、前記加締め爪が加締め付けられたとき溝の縁が前記電線導体に食い込むようになされると共に、食い込み量が異なるように溝の深さを相異させたことを特徴とする圧着端子。A bottom plate portion on which the electric wire conductor is placed; and a pair of caulking claws extending on both sides of the bottom plate portion and crimped to the electric wire conductor; and at least the inner surface of the bottom plate portion, In the crimp terminal formed with a plurality of conductor locking grooves extending in the direction intersecting the axis,
The plurality of conductor locking grooves are formed so that the edge of the groove bites into the electric wire conductor when the crimping claw is crimped, and the depth of the groove is varied so that the amount of biting is different. Crimp terminal characterized by that. 前記複数本の導体係止溝のうち、電線導体の基端側に対応して前記底板部の端部寄りに位置する導体係止溝の溝の深さを、少なくとも前記底板部の中央寄りに位置する導体係止溝よりも浅く設定したことを特徴とする請求項１記載の圧着端子。Of the plurality of conductor locking grooves, the depth of the conductor locking groove located near the end of the bottom plate portion corresponding to the base end side of the wire conductor is at least near the center of the bottom plate portion. The crimp terminal according to claim 1, wherein the crimp terminal is set shallower than the positioned conductor locking groove.
JP2001213950A 2001-07-13 2001-07-13 Crimp terminal Expired - Fee Related JP3868234B2 (en)

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